Spring for pumping vessel



FIG. 1 is a perspective view of a spring for pumping vessel, showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings show portions of the spring for pumping vessel which form no part of the claimed design. 

CLAIM We claim the ornamental design for a spring for pumping vessel, as shown and described. 